Didn't watch the presentation, so maybe it's addressed, but what is the iPad the convergence of? Unlike a Swiss army knife (knife, saw, scissors, tweezers, toot

Didn't watch the presentation, so maybe it's addressed, but what is the iPad the convergence of? Unlike a Swiss army knife (knife, saw, scissors, tweezers, toothpick, etc.), or pocket computer/phone/camera. It's a relatively different type of device (not a necessary new one, though), not a mashup of otherwise independent devices.